Commercial Electrical Codes National Electrical Code - Chapter 230, 701 & 702 (view all) - Chapter 230: Multiple Electrical Services in the Same Building -- NEC/230/#1 - 4/17/13 - Chapter 7: Generator Installation for Required Emergency and Standby Power Supply Systems -- NEC/7/#1 - 1/16/13 - Chapter 702: Optional Installation of Fuel Fired Generators for Emergency and Standby Power Supply Systems for One and Two Family Dwellings -- NEC/702/#1 - 9/1/99 (PDF Document, 16kb) PDF Information Some of the links on this page are to PDF documents. To open PDF files you will need Adobe Acrobat Reader installed on your computer, it is available for free from Adobe.com.